./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:30:43,340 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:30:43,343 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:30:43,393 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:30:43,394 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:30:43,398 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:30:43,400 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:30:43,404 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:30:43,407 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:30:43,412 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:30:43,413 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:30:43,415 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:30:43,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:30:43,419 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:30:43,422 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:30:43,429 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:30:43,430 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:30:43,431 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:30:43,433 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:30:43,436 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:30:43,438 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:30:43,439 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:30:43,440 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:30:43,441 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:30:43,445 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:30:43,445 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:30:43,446 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:30:43,447 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:30:43,447 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:30:43,449 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:30:43,449 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:30:43,450 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:30:43,451 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:30:43,452 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:30:43,453 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:30:43,453 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:30:43,454 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:30:43,454 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:30:43,454 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:30:43,455 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:30:43,456 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:30:43,457 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:30:43,481 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:30:43,482 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:30:43,482 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:30:43,482 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:30:43,483 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:30:43,483 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:30:43,483 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:30:43,484 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:30:43,484 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:30:43,484 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:30:43,484 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:30:43,484 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:30:43,485 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:30:43,485 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:30:43,485 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:30:43,485 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:30:43,486 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:30:43,486 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:30:43,487 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:30:43,487 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:30:43,487 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:30:43,487 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:30:43,487 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:30:43,488 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:30:43,488 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:30:43,488 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:30:43,488 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:30:43,488 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:30:43,489 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:30:43,489 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:30:43,489 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:30:43,489 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:30:43,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:30:43,490 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:30:43,490 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:30:43,490 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:30:43,490 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:30:43,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:30:43,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:30:43,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:30:43,491 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:30:43,491 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 [2021-11-25 20:30:43,757 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:30:43,777 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:30:43,780 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:30:43,781 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:30:43,782 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:30:43,783 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-crafted/zero_sum_m4.c [2021-11-25 20:30:43,846 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/data/39b16d669/1c74894df2b44aefb0b0c970706e4f1b/FLAGea63d9ad4 [2021-11-25 20:30:44,378 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:30:44,382 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/sv-benchmarks/c/array-crafted/zero_sum_m4.c [2021-11-25 20:30:44,391 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/data/39b16d669/1c74894df2b44aefb0b0c970706e4f1b/FLAGea63d9ad4 [2021-11-25 20:30:44,723 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/data/39b16d669/1c74894df2b44aefb0b0c970706e4f1b [2021-11-25 20:30:44,726 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:30:44,727 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:30:44,729 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:30:44,729 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:30:44,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:30:44,735 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:30:44" (1/1) ... [2021-11-25 20:30:44,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51396d14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:44, skipping insertion in model container [2021-11-25 20:30:44,736 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:30:44" (1/1) ... [2021-11-25 20:30:44,754 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:30:44,770 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:30:44,974 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2021-11-25 20:30:44,994 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:30:45,001 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:30:45,013 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2021-11-25 20:30:45,024 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:30:45,037 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:30:45,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45 WrapperNode [2021-11-25 20:30:45,038 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:30:45,039 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:30:45,039 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:30:45,039 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:30:45,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,054 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,076 INFO L137 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2021-11-25 20:30:45,077 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:30:45,077 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:30:45,077 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:30:45,078 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:30:45,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,087 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,090 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,090 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,105 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,107 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,116 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:30:45,117 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:30:45,124 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:30:45,124 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:30:45,125 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (1/1) ... [2021-11-25 20:30:45,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:30:45,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:45,166 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:30:45,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:30:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:30:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:30:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:30:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:30:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:30:45,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:30:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:30:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:30:45,288 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:30:45,289 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:30:45,556 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:30:45,659 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:30:45,660 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-25 20:30:45,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:30:45 BoogieIcfgContainer [2021-11-25 20:30:45,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:30:45,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:30:45,666 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:30:45,677 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:30:45,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:30:44" (1/3) ... [2021-11-25 20:30:45,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffc87de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:30:45, skipping insertion in model container [2021-11-25 20:30:45,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:30:45" (2/3) ... [2021-11-25 20:30:45,679 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffc87de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:30:45, skipping insertion in model container [2021-11-25 20:30:45,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:30:45" (3/3) ... [2021-11-25 20:30:45,680 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m4.c [2021-11-25 20:30:45,685 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:30:45,685 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:30:45,747 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:30:45,758 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:30:45,758 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:30:45,783 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:45,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:30:45,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:45,789 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:45,789 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:45,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:45,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1453537585, now seen corresponding path program 1 times [2021-11-25 20:30:45,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:45,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892761296] [2021-11-25 20:30:45,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:45,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:45,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:46,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:30:46,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:46,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892761296] [2021-11-25 20:30:46,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892761296] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:46,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:30:46,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:30:46,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337868763] [2021-11-25 20:30:46,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:46,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:30:46,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:46,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:30:46,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:30:46,142 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:46,231 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2021-11-25 20:30:46,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:30:46,234 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 20:30:46,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:46,244 INFO L225 Difference]: With dead ends: 32 [2021-11-25 20:30:46,244 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 20:30:46,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:30:46,252 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:46,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:46,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 20:30:46,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 20:30:46,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2021-11-25 20:30:46,281 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2021-11-25 20:30:46,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:46,281 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2021-11-25 20:30:46,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,281 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2021-11-25 20:30:46,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:30:46,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:46,282 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:46,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:30:46,283 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:46,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:46,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1839481755, now seen corresponding path program 1 times [2021-11-25 20:30:46,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:46,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636006457] [2021-11-25 20:30:46,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:46,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:46,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:46,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:30:46,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:46,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636006457] [2021-11-25 20:30:46,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636006457] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:46,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:30:46,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:30:46,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932069112] [2021-11-25 20:30:46,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:46,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:30:46,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:46,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:30:46,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:30:46,341 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:46,401 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2021-11-25 20:30:46,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:30:46,402 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:30:46,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:46,402 INFO L225 Difference]: With dead ends: 33 [2021-11-25 20:30:46,403 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 20:30:46,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:30:46,405 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:46,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:30:46,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 20:30:46,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 20:30:46,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-25 20:30:46,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2021-11-25 20:30:46,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:46,413 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-25 20:30:46,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:46,414 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-25 20:30:46,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:30:46,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:46,415 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:46,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:30:46,416 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:46,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:46,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1144628674, now seen corresponding path program 1 times [2021-11-25 20:30:46,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:46,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023170538] [2021-11-25 20:30:46,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:46,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:46,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:46,493 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:30:46,493 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:46,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023170538] [2021-11-25 20:30:46,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023170538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:46,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538631569] [2021-11-25 20:30:46,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:46,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:46,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:46,496 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:46,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:30:46,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:46,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:30:46,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:46,750 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:30:46,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:46,835 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:30:46,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538631569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:46,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410250469] [2021-11-25 20:30:46,860 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:30:46,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:46,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:46,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:46,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:46,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,029 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:47,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:47,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:47,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:47,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:47,301 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:47,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:47,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:47,815 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:47,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:47,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:47,997 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:47,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 20:30:47,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599970870] [2021-11-25 20:30:47,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:47,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:30:47,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:47,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:30:47,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:30:48,000 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:48,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:48,061 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2021-11-25 20:30:48,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:30:48,062 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 20:30:48,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:48,063 INFO L225 Difference]: With dead ends: 43 [2021-11-25 20:30:48,063 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 20:30:48,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:30:48,065 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:48,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:48,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 20:30:48,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-25 20:30:48,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:48,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-25 20:30:48,072 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2021-11-25 20:30:48,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:48,072 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-25 20:30:48,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:48,073 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-25 20:30:48,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:30:48,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:48,074 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:48,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:48,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:48,301 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:48,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:48,302 INFO L85 PathProgramCache]: Analyzing trace with hash 88512748, now seen corresponding path program 2 times [2021-11-25 20:30:48,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:48,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103837281] [2021-11-25 20:30:48,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:48,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:48,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:48,378 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:30:48,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:48,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103837281] [2021-11-25 20:30:48,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103837281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:48,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242599452] [2021-11-25 20:30:48,379 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:48,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:48,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:48,385 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:48,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:30:48,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:30:48,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:48,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:30:48,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:48,534 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:30:48,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:48,617 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:30:48,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242599452] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:48,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136583635] [2021-11-25 20:30:48,637 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:30:48,638 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:48,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:48,638 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:48,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:48,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:48,703 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:48,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:48,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:48,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:48,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:48,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:30:48,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:48,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:30:48,864 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:30:48,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:30:48,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:49,291 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:49,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:49,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:49,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:49,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-25 20:30:49,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267862577] [2021-11-25 20:30:49,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:49,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:30:49,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:49,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:30:49,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:30:49,497 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:49,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:49,586 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2021-11-25 20:30:49,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:30:49,586 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 20:30:49,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:49,587 INFO L225 Difference]: With dead ends: 49 [2021-11-25 20:30:49,587 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 20:30:49,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:30:49,589 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:49,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 5 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:49,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 20:30:49,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 20:30:49,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:49,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-25 20:30:49,596 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2021-11-25 20:30:49,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:49,596 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-25 20:30:49,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:49,596 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-25 20:30:49,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:30:49,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:49,598 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:49,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:49,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:49,819 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:49,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:49,820 INFO L85 PathProgramCache]: Analyzing trace with hash -1125282897, now seen corresponding path program 3 times [2021-11-25 20:30:49,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:49,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782186319] [2021-11-25 20:30:49,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:49,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:50,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:30:51,540 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:51,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782186319] [2021-11-25 20:30:51,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782186319] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:51,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46865084] [2021-11-25 20:30:51,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:30:51,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:51,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:51,543 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:51,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:30:51,615 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:30:51,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:51,617 WARN L261 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 20:30:51,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:52,534 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:30:52,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:53,741 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-25 20:30:53,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 52 [2021-11-25 20:30:53,848 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-25 20:30:53,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 17 [2021-11-25 20:30:53,911 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:30:53,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46865084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:53,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89755278] [2021-11-25 20:30:53,915 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:30:53,915 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:53,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:53,916 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:53,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:53,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:53,960 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:53,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:53,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:53,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:54,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:54,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:30:54,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:54,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:54,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:54,105 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:30:54,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:30:54,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:54,416 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:54,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '981#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:54,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:54,781 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:54,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 24] total 45 [2021-11-25 20:30:54,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204615094] [2021-11-25 20:30:54,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:54,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-25 20:30:54,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:54,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-25 20:30:54,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=2311, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:30:54,787 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:55,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:55,546 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2021-11-25 20:30:55,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:30:55,546 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-25 20:30:55,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:55,548 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:30:55,548 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:30:55,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 47 SyntacticMatches, 26 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=145, Invalid=2405, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:30:55,550 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:55,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 63 Invalid, 1145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:30:55,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:30:55,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2021-11-25 20:30:55,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:55,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-25 20:30:55,560 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2021-11-25 20:30:55,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:55,561 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-25 20:30:55,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:55,561 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-25 20:30:55,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 20:30:55,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:55,563 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:55,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:55,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:55,781 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:55,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:55,781 INFO L85 PathProgramCache]: Analyzing trace with hash -76458201, now seen corresponding path program 4 times [2021-11-25 20:30:55,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:55,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694588388] [2021-11-25 20:30:55,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:55,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:55,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:55,871 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:30:55,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:55,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694588388] [2021-11-25 20:30:55,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694588388] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:55,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789525788] [2021-11-25 20:30:55,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:30:55,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:55,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:55,873 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:55,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:30:55,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:55,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:30:55,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:56,043 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:30:56,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:56,109 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:30:56,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789525788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:56,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2022464341] [2021-11-25 20:30:56,112 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:30:56,112 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:56,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:56,113 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:56,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:56,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:56,159 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:56,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:56,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:56,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:56,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:56,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:30:56,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:56,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:30:56,276 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:30:56,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:30:56,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:56,614 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:56,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1393#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:56,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:56,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:56,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:30:56,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662323079] [2021-11-25 20:30:56,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:56,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:30:56,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:56,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:30:56,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:30:56,797 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:56,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:56,994 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2021-11-25 20:30:56,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:30:56,995 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-25 20:30:56,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:56,995 INFO L225 Difference]: With dead ends: 102 [2021-11-25 20:30:56,996 INFO L226 Difference]: Without dead ends: 53 [2021-11-25 20:30:56,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:30:56,997 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:56,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 9 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:30:56,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-25 20:30:57,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-25 20:30:57,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:57,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2021-11-25 20:30:57,006 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2021-11-25 20:30:57,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:57,007 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2021-11-25 20:30:57,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:57,007 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2021-11-25 20:30:57,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 20:30:57,008 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:57,008 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:57,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:57,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:30:57,233 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:57,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:57,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1622138321, now seen corresponding path program 5 times [2021-11-25 20:30:57,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:57,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243802000] [2021-11-25 20:30:57,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:57,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:57,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:57,305 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:30:57,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:57,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243802000] [2021-11-25 20:30:57,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243802000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:57,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035604562] [2021-11-25 20:30:57,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:57,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:57,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:57,321 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:57,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:30:57,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:30:57,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:57,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:30:57,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:57,486 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:30:57,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:30:57,567 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:30:57,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035604562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:30:57,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [519932741] [2021-11-25 20:30:57,569 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:30:57,570 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:30:57,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:30:57,570 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:30:57,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:30:57,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:57,613 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:30:57,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:30:57,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:57,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:30:57,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:57,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:30:57,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:30:57,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:30:57,712 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:30:57,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:30:57,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:30:58,033 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:30:58,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1907#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:30:58,175 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:30:58,175 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:30:58,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 20:30:58,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126609401] [2021-11-25 20:30:58,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:30:58,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:30:58,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:58,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:30:58,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:30:58,177 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:58,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:58,345 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2021-11-25 20:30:58,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:30:58,346 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-25 20:30:58,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:58,346 INFO L225 Difference]: With dead ends: 82 [2021-11-25 20:30:58,346 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 20:30:58,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:30:58,348 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 49 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:58,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 11 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:30:58,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 20:30:58,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 20:30:58,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:58,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-25 20:30:58,355 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2021-11-25 20:30:58,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:58,355 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-25 20:30:58,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:30:58,356 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-25 20:30:58,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:30:58,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:58,357 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:30:58,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:58,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:58,573 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:58,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:58,573 INFO L85 PathProgramCache]: Analyzing trace with hash -231017630, now seen corresponding path program 6 times [2021-11-25 20:30:58,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:58,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238191726] [2021-11-25 20:30:58,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:58,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:00,823 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:00,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:00,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238191726] [2021-11-25 20:31:00,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238191726] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:00,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100753064] [2021-11-25 20:31:00,824 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:31:00,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:00,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:00,825 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:00,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:31:00,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:31:00,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:00,910 WARN L261 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-25 20:31:00,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:03,011 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:31:03,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:05,557 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-25 20:31:05,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-25 20:31:05,864 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-25 20:31:05,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-25 20:31:05,948 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:31:05,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100753064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:05,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [486670697] [2021-11-25 20:31:05,950 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:05,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:05,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:05,951 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:05,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:05,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:05,996 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:05,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:06,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:06,029 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:06,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:06,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:06,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:06,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:06,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:06,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:06,108 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:06,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:06,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:06,375 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:06,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2474#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:06,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:06,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:06,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 30, 32] total 87 [2021-11-25 20:31:06,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231824168] [2021-11-25 20:31:06,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:06,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-25 20:31:06,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:06,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-25 20:31:06,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=8072, Unknown=0, NotChecked=0, Total=8372 [2021-11-25 20:31:06,885 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 87 states, 87 states have (on average 1.2298850574712643) internal successors, (107), 87 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:15,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:15,689 INFO L93 Difference]: Finished difference Result 154 states and 192 transitions. [2021-11-25 20:31:15,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 20:31:15,690 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.2298850574712643) internal successors, (107), 87 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:31:15,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:15,692 INFO L225 Difference]: With dead ends: 154 [2021-11-25 20:31:15,693 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 20:31:15,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 53 SyntacticMatches, 14 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4174 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=841, Invalid=15929, Unknown=0, NotChecked=0, Total=16770 [2021-11-25 20:31:15,699 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 30 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 5196 mSolverCounterSat, 504 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 5700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 504 IncrementalHoareTripleChecker+Valid, 5196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:15,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 238 Invalid, 5700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [504 Valid, 5196 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-25 20:31:15,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 20:31:15,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 86. [2021-11-25 20:31:15,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.2705882352941176) internal successors, (108), 85 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:15,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2021-11-25 20:31:15,721 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 40 [2021-11-25 20:31:15,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:15,722 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2021-11-25 20:31:15,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.2298850574712643) internal successors, (107), 87 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:15,722 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2021-11-25 20:31:15,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 20:31:15,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:15,724 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:15,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:15,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:15,929 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:15,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:15,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1059651906, now seen corresponding path program 7 times [2021-11-25 20:31:15,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:15,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769075141] [2021-11-25 20:31:15,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:15,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:15,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:16,010 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:31:16,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769075141] [2021-11-25 20:31:16,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769075141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180185649] [2021-11-25 20:31:16,011 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:31:16,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:16,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:16,012 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:16,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:31:16,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:16,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:31:16,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:16,208 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:31:16,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:16,279 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:31:16,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180185649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:16,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461739160] [2021-11-25 20:31:16,281 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:16,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:16,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:16,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:16,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:16,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,342 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:16,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:16,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:31:16,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:16,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:16,469 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:16,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:16,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:16,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:16,893 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3275#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:16,893 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:16,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:16,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 20:31:16,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115819370] [2021-11-25 20:31:16,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:16,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:31:16,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:16,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:31:16,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:31:16,896 INFO L87 Difference]: Start difference. First operand 86 states and 108 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:17,127 INFO L93 Difference]: Finished difference Result 164 states and 204 transitions. [2021-11-25 20:31:17,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:31:17,127 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 20:31:17,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:17,128 INFO L225 Difference]: With dead ends: 164 [2021-11-25 20:31:17,128 INFO L226 Difference]: Without dead ends: 69 [2021-11-25 20:31:17,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:31:17,130 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:17,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 15 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:17,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-25 20:31:17,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-25 20:31:17,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.25) internal successors, (85), 68 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2021-11-25 20:31:17,143 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 41 [2021-11-25 20:31:17,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:17,144 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2021-11-25 20:31:17,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:17,144 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2021-11-25 20:31:17,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 20:31:17,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:17,146 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:17,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:17,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:17,349 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:17,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:17,349 INFO L85 PathProgramCache]: Analyzing trace with hash 190076756, now seen corresponding path program 8 times [2021-11-25 20:31:17,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:17,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635333096] [2021-11-25 20:31:17,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:17,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:17,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:31:17,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:17,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635333096] [2021-11-25 20:31:17,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635333096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:17,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353004670] [2021-11-25 20:31:17,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:31:17,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:17,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:17,457 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:17,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:31:17,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:31:17,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:17,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:31:17,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:31:17,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:17,772 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:31:17,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353004670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:17,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [837522706] [2021-11-25 20:31:17,775 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:17,775 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:17,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:17,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:17,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:17,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:17,815 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:17,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:17,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:17,865 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:17,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:17,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:17,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:31:17,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:17,948 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:17,968 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:31:17,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:31:18,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:18,279 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:18,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4007#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:18,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:18,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:18,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-25 20:31:18,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32946410] [2021-11-25 20:31:18,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:18,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:31:18,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:18,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:31:18,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:31:18,443 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:18,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:18,684 INFO L93 Difference]: Finished difference Result 104 states and 133 transitions. [2021-11-25 20:31:18,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:31:18,686 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-25 20:31:18,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:18,686 INFO L225 Difference]: With dead ends: 104 [2021-11-25 20:31:18,686 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:31:18,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:31:18,688 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 267 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 267 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:18,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 13 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [267 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:18,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:31:18,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 20:31:18,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:18,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2021-11-25 20:31:18,700 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2021-11-25 20:31:18,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:18,700 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2021-11-25 20:31:18,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:18,701 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2021-11-25 20:31:18,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:31:18,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:18,702 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:18,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:18,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:18,917 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:18,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:18,917 INFO L85 PathProgramCache]: Analyzing trace with hash 775002255, now seen corresponding path program 9 times [2021-11-25 20:31:18,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:18,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004259910] [2021-11-25 20:31:18,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:18,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:19,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:22,128 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:22,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:22,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004259910] [2021-11-25 20:31:22,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004259910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:22,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108512060] [2021-11-25 20:31:22,128 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:31:22,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:22,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:22,129 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:22,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:31:22,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:31:22,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:22,211 WARN L261 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-25 20:31:22,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:25,712 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:31:25,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:30,292 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-25 20:31:30,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-25 20:31:30,768 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-25 20:31:30,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-25 20:31:30,878 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:31:30,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108512060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:30,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570073629] [2021-11-25 20:31:30,880 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:30,880 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:30,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:30,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:30,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:30,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:30,917 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:30,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:30,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:30,947 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:30,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:30,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:30,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:31:31,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:31,049 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:31,069 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:31:31,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:31:31,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:31,323 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:31,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4724#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:31,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:31,995 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:31,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 38, 40] total 112 [2021-11-25 20:31:31,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846699304] [2021-11-25 20:31:31,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:31,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-25 20:31:31,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:31,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-25 20:31:32,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=13185, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 20:31:32,001 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 112 states, 112 states have (on average 1.1785714285714286) internal successors, (132), 112 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:47,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:47,072 INFO L93 Difference]: Finished difference Result 197 states and 238 transitions. [2021-11-25 20:31:47,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-25 20:31:47,073 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.1785714285714286) internal successors, (132), 112 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 20:31:47,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:47,075 INFO L225 Difference]: With dead ends: 197 [2021-11-25 20:31:47,075 INFO L226 Difference]: Without dead ends: 193 [2021-11-25 20:31:47,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 62 SyntacticMatches, 16 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7162 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=1285, Invalid=27445, Unknown=0, NotChecked=0, Total=28730 [2021-11-25 20:31:47,082 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 31 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 8190 mSolverCounterSat, 713 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 8903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 713 IncrementalHoareTripleChecker+Valid, 8190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:47,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 461 Invalid, 8903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [713 Valid, 8190 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2021-11-25 20:31:47,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-25 20:31:47,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 104. [2021-11-25 20:31:47,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.2135922330097086) internal successors, (125), 103 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:47,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2021-11-25 20:31:47,111 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 49 [2021-11-25 20:31:47,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:47,111 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2021-11-25 20:31:47,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.1785714285714286) internal successors, (132), 112 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:47,112 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2021-11-25 20:31:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:31:47,113 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:47,114 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:47,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:47,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:47,316 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:47,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:47,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1666675193, now seen corresponding path program 10 times [2021-11-25 20:31:47,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:47,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580234889] [2021-11-25 20:31:47,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:47,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:47,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:47,419 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:31:47,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:47,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580234889] [2021-11-25 20:31:47,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580234889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:47,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974962995] [2021-11-25 20:31:47,421 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:31:47,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:47,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:47,422 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:47,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:31:47,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:47,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:31:47,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:47,655 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:31:47,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:47,750 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 20:31:47,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974962995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:47,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470326857] [2021-11-25 20:31:47,753 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:47,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:47,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:47,754 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:47,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:47,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,792 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:31:47,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:31:47,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,826 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:47,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:47,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:47,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:47,915 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:47,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:47,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:48,170 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:48,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5728#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:48,372 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:48,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:48,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 20:31:48,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927703568] [2021-11-25 20:31:48,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:48,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:31:48,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:48,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:31:48,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:31:48,374 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:48,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:48,658 INFO L93 Difference]: Finished difference Result 195 states and 233 transitions. [2021-11-25 20:31:48,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:31:48,659 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 20:31:48,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:48,659 INFO L225 Difference]: With dead ends: 195 [2021-11-25 20:31:48,659 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 20:31:48,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:31:48,662 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:48,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:48,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 20:31:48,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-25 20:31:48,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:48,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2021-11-25 20:31:48,690 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 50 [2021-11-25 20:31:48,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:48,691 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2021-11-25 20:31:48,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:48,691 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2021-11-25 20:31:48,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:31:48,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:48,692 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:48,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:48,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:31:48,897 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:48,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:48,897 INFO L85 PathProgramCache]: Analyzing trace with hash 817266225, now seen corresponding path program 11 times [2021-11-25 20:31:48,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:48,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507629601] [2021-11-25 20:31:48,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:48,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:48,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:49,011 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 20:31:49,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:49,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507629601] [2021-11-25 20:31:49,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507629601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:49,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194929414] [2021-11-25 20:31:49,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:31:49,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:49,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:49,013 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:49,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:31:49,117 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:31:49,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:49,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:31:49,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:49,274 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 20:31:49,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:49,395 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 20:31:49,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194929414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:31:49,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1231829627] [2021-11-25 20:31:49,398 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:31:49,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:49,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:49,398 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:49,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:49,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,444 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:31:49,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:31:49,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:31:49,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:31:49,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:49,546 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:31:49,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:31:49,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:31:49,803 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:49,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6606#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:31:49,990 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:49,991 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:49,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 20:31:49,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78468652] [2021-11-25 20:31:49,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:49,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:31:49,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:49,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:31:49,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:31:49,992 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:50,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:50,223 INFO L93 Difference]: Finished difference Result 123 states and 150 transitions. [2021-11-25 20:31:50,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:31:50,223 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 20:31:50,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:50,224 INFO L225 Difference]: With dead ends: 123 [2021-11-25 20:31:50,224 INFO L226 Difference]: Without dead ends: 59 [2021-11-25 20:31:50,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 139 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:31:50,225 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:50,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 15 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:31:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-25 20:31:50,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-25 20:31:50,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:50,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-25 20:31:50,243 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2021-11-25 20:31:50,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:50,244 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-25 20:31:50,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:50,244 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-25 20:31:50,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:31:50,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:50,245 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:50,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:31:50,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:50,450 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:50,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:50,451 INFO L85 PathProgramCache]: Analyzing trace with hash 7452930, now seen corresponding path program 12 times [2021-11-25 20:31:50,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:50,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969947893] [2021-11-25 20:31:50,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:50,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:50,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:55,277 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 4 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:55,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:55,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969947893] [2021-11-25 20:31:55,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969947893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:55,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597388649] [2021-11-25 20:31:55,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:31:55,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:55,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:55,278 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:55,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:31:55,396 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:31:55,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:31:55,399 WARN L261 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 167 conjunts are in the unsatisfiable core [2021-11-25 20:31:55,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:00,413 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:00,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:07,671 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-25 20:32:07,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-25 20:32:09,331 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-25 20:32:09,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-25 20:32:09,514 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:32:09,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597388649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:09,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265254062] [2021-11-25 20:32:09,517 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:32:09,517 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:09,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:09,519 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:09,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:09,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,560 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:32:09,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:32:09,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,599 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:32:09,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:32:09,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:32:09,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:09,688 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:32:09,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:32:09,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:32:09,912 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:10,749 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7452#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:32:10,749 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:10,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:10,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 46, 48] total 136 [2021-11-25 20:32:10,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108851566] [2021-11-25 20:32:10,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:10,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-25 20:32:10,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:10,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-25 20:32:10,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=19245, Unknown=0, NotChecked=0, Total=19740 [2021-11-25 20:32:10,752 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 136 states, 136 states have (on average 1.1470588235294117) internal successors, (156), 136 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:32,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:32,322 INFO L93 Difference]: Finished difference Result 226 states and 267 transitions. [2021-11-25 20:32:32,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-25 20:32:32,323 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.1470588235294117) internal successors, (156), 136 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 20:32:32,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:32,325 INFO L225 Difference]: With dead ends: 226 [2021-11-25 20:32:32,325 INFO L226 Difference]: Without dead ends: 222 [2021-11-25 20:32:32,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 73 SyntacticMatches, 17 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10535 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=1667, Invalid=39339, Unknown=0, NotChecked=0, Total=41006 [2021-11-25 20:32:32,330 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 29 mSDsluCounter, 508 mSDsCounter, 0 mSdLazyCounter, 10330 mSolverCounterSat, 828 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 11158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 828 IncrementalHoareTripleChecker+Valid, 10330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:32,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 509 Invalid, 11158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [828 Valid, 10330 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2021-11-25 20:32:32,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-25 20:32:32,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 123. [2021-11-25 20:32:32,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.180327868852459) internal successors, (144), 122 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:32,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 144 transitions. [2021-11-25 20:32:32,371 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 144 transitions. Word has length 58 [2021-11-25 20:32:32,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:32,371 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 144 transitions. [2021-11-25 20:32:32,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.1470588235294117) internal successors, (156), 136 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:32,371 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 144 transitions. [2021-11-25 20:32:32,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:32:32,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:32,373 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:32,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:32,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:32,573 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:32,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:32,574 INFO L85 PathProgramCache]: Analyzing trace with hash 938710366, now seen corresponding path program 13 times [2021-11-25 20:32:32,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:32,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293704271] [2021-11-25 20:32:32,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:32,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:32,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:32,719 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-25 20:32:32,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:32,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293704271] [2021-11-25 20:32:32,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293704271] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:32,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450970339] [2021-11-25 20:32:32,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:32:32,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:32,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:32,725 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:32,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:32:32,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:32,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:32:32,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:33,032 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-25 20:32:33,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:33,148 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-25 20:32:33,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450970339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:33,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [847331625] [2021-11-25 20:32:33,151 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:32:33,151 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:33,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:33,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:33,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:33,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,191 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:32:33,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:32:33,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,226 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:32:33,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:32:33,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:32:33,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:33,315 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:32:33,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:32:33,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:32:33,563 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:33,745 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8627#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:32:33,746 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:33,746 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:33,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 20:32:33,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225592420] [2021-11-25 20:32:33,746 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:33,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:32:33,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:33,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:32:33,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:32:33,747 INFO L87 Difference]: Start difference. First operand 123 states and 144 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:34,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:34,028 INFO L93 Difference]: Finished difference Result 231 states and 269 transitions. [2021-11-25 20:32:34,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:34,029 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-25 20:32:34,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:34,029 INFO L225 Difference]: With dead ends: 231 [2021-11-25 20:32:34,029 INFO L226 Difference]: Without dead ends: 98 [2021-11-25 20:32:34,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:32:34,031 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:34,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 9 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:32:34,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-25 20:32:34,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-11-25 20:32:34,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.1649484536082475) internal successors, (113), 97 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:34,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2021-11-25 20:32:34,068 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 59 [2021-11-25 20:32:34,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:34,068 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2021-11-25 20:32:34,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:34,068 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2021-11-25 20:32:34,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:32:34,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:34,069 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:34,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:34,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:32:34,273 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:34,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:34,273 INFO L85 PathProgramCache]: Analyzing trace with hash -794807180, now seen corresponding path program 14 times [2021-11-25 20:32:34,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:34,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799742382] [2021-11-25 20:32:34,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:34,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:34,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:34,399 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-25 20:32:34,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:34,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799742382] [2021-11-25 20:32:34,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799742382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:34,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597687544] [2021-11-25 20:32:34,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:32:34,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:34,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:34,401 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:34,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:32:34,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:32:34,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:34,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:32:34,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:34,739 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-25 20:32:34,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-25 20:32:34,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597687544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:32:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230686356] [2021-11-25 20:32:34,874 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:32:34,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:34,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:34,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:34,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:34,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:34,916 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:32:34,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:32:34,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:34,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:32:34,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:34,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:32:34,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:34,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:35,015 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:32:35,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:32:35,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:32:35,312 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:35,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9666#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:32:35,463 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:35,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:32:35,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 20:32:35,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446120287] [2021-11-25 20:32:35,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:35,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:32:35,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:35,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:32:35,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:32:35,464 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:35,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:35,696 INFO L93 Difference]: Finished difference Result 144 states and 171 transitions. [2021-11-25 20:32:35,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:35,696 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 20:32:35,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:35,697 INFO L225 Difference]: With dead ends: 144 [2021-11-25 20:32:35,697 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 20:32:35,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 165 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:32:35,698 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:35,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 7 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:32:35,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 20:32:35,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-25 20:32:35,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:35,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2021-11-25 20:32:35,722 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2021-11-25 20:32:35,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:35,722 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2021-11-25 20:32:35,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:32:35,723 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2021-11-25 20:32:35,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 20:32:35,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:35,724 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:35,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:35,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:32:35,929 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:35,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:35,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1806888303, now seen corresponding path program 15 times [2021-11-25 20:32:35,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:35,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512587977] [2021-11-25 20:32:35,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:35,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:36,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:42,646 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 3 proven. 186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:42,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:42,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512587977] [2021-11-25 20:32:42,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512587977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:42,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853687817] [2021-11-25 20:32:42,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:32:42,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:42,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:42,650 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:42,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:32:42,827 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:32:42,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:32:42,830 WARN L261 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-25 20:32:42,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:50,336 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:32:50,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:02,366 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-25 20:33:02,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-25 20:33:05,327 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-25 20:33:05,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-25 20:33:05,538 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:33:05,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853687817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:05,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758415814] [2021-11-25 20:33:05,540 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:33:05,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:05,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:05,541 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:05,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:05,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:05,582 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:33:05,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:33:05,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:05,625 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:05,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:05,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:05,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:05,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:05,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:05,723 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:05,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:33:05,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:06,013 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:07,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10650#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:07,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:07,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:07,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 54, 56] total 158 [2021-11-25 20:33:07,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398097559] [2021-11-25 20:33:07,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:07,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2021-11-25 20:33:07,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:07,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-11-25 20:33:07,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=25871, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 20:33:07,061 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 158 states, 158 states have (on average 1.1265822784810127) internal successors, (178), 158 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:23,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:23,261 INFO L93 Difference]: Finished difference Result 121 states and 136 transitions. [2021-11-25 20:33:23,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-25 20:33:23,262 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 1.1265822784810127) internal successors, (178), 158 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-25 20:33:23,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:23,263 INFO L225 Difference]: With dead ends: 121 [2021-11-25 20:33:23,263 INFO L226 Difference]: Without dead ends: 118 [2021-11-25 20:33:23,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 86 SyntacticMatches, 18 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9310 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=1073, Invalid=43237, Unknown=0, NotChecked=0, Total=44310 [2021-11-25 20:33:23,267 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 7390 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 7522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 7390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:23,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 201 Invalid, 7522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 7390 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2021-11-25 20:33:23,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-25 20:33:23,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 112. [2021-11-25 20:33:23,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.1441441441441442) internal successors, (127), 111 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:23,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 127 transitions. [2021-11-25 20:33:23,308 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 127 transitions. Word has length 67 [2021-11-25 20:33:23,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:23,309 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 127 transitions. [2021-11-25 20:33:23,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 1.1265822784810127) internal successors, (178), 158 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:23,309 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 127 transitions. [2021-11-25 20:33:23,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 20:33:23,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:23,309 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:23,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:23,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:23,510 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:23,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:23,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1375294233, now seen corresponding path program 16 times [2021-11-25 20:33:23,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:23,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434011504] [2021-11-25 20:33:23,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:23,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:23,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:23,660 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-25 20:33:23,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:23,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434011504] [2021-11-25 20:33:23,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434011504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:23,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311858852] [2021-11-25 20:33:23,661 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:33:23,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:23,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:23,662 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:23,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:33:23,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:23,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:33:23,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:23,974 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-25 20:33:23,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:24,080 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-25 20:33:24,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311858852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:24,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157829228] [2021-11-25 20:33:24,082 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:33:24,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:24,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:24,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:24,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:24,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,144 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:24,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:24,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:33:24,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:24,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,234 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:24,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:33:24,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:24,439 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:24,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11632#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:24,613 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:24,613 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:24,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 20:33:24,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952477477] [2021-11-25 20:33:24,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:24,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:33:24,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:24,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:33:24,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:33:24,614 INFO L87 Difference]: Start difference. First operand 112 states and 127 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:24,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:24,976 INFO L93 Difference]: Finished difference Result 222 states and 252 transitions. [2021-11-25 20:33:24,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:33:24,977 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-25 20:33:24,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:24,978 INFO L225 Difference]: With dead ends: 222 [2021-11-25 20:33:24,978 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:33:24,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=284, Invalid=1122, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:33:24,978 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:24,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 11 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:33:24,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:33:25,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-25 20:33:25,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.1428571428571428) internal successors, (128), 112 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:25,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 128 transitions. [2021-11-25 20:33:25,021 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 128 transitions. Word has length 68 [2021-11-25 20:33:25,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:25,021 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 128 transitions. [2021-11-25 20:33:25,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:25,021 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 128 transitions. [2021-11-25 20:33:25,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 20:33:25,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:25,022 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:25,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:25,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:33:25,223 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:25,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:25,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1301502319, now seen corresponding path program 17 times [2021-11-25 20:33:25,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:25,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151657632] [2021-11-25 20:33:25,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:25,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:25,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:25,394 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 20:33:25,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:25,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151657632] [2021-11-25 20:33:25,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151657632] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:25,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326757971] [2021-11-25 20:33:25,394 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:25,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:25,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:25,395 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:25,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:33:25,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:33:25,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:25,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:33:25,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 20:33:25,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 20:33:25,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326757971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:25,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170947057] [2021-11-25 20:33:25,883 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:33:25,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:25,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:25,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:25,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:25,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:25,934 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:33:25,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:33:25,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:25,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:33:25,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:25,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:25,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:25,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:25,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,007 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:26,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:33:26,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:26,186 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:26,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12742#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:26,342 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:26,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:26,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 20:33:26,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325650259] [2021-11-25 20:33:26,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:26,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:33:26,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:26,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:33:26,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:33:26,344 INFO L87 Difference]: Start difference. First operand 113 states and 128 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:26,692 INFO L93 Difference]: Finished difference Result 166 states and 194 transitions. [2021-11-25 20:33:26,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:33:26,692 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-25 20:33:26,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:26,693 INFO L225 Difference]: With dead ends: 166 [2021-11-25 20:33:26,693 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 20:33:26,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:33:26,693 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 103 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 474 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 474 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:26,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 9 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [474 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:33:26,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 20:33:26,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-11-25 20:33:26,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2021-11-25 20:33:26,719 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2021-11-25 20:33:26,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:26,719 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2021-11-25 20:33:26,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,719 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2021-11-25 20:33:26,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 20:33:26,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:26,720 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:26,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:26,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:26,921 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:26,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:26,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1853093538, now seen corresponding path program 18 times [2021-11-25 20:33:26,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:26,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762645633] [2021-11-25 20:33:26,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:26,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:27,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:35,105 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 3 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:35,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:35,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762645633] [2021-11-25 20:33:35,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762645633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:35,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148422541] [2021-11-25 20:33:35,106 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:33:35,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:35,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:35,107 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:35,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:33:35,285 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:33:35,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:35,289 WARN L261 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 231 conjunts are in the unsatisfiable core [2021-11-25 20:33:35,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:42,414 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:42,416 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:33:42,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 20:33:42,651 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:33:42,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:59,056 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-25 20:33:59,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-25 20:34:03,053 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-25 20:34:03,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-25 20:34:03,247 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:34:03,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148422541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:34:03,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1081960403] [2021-11-25 20:34:03,249 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:34:03,249 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:34:03,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:34:03,250 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:34:03,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:34:03,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,287 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:34:03,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:34:03,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:34:03,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:34:03,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:03,371 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:34:03,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:34:03,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:34:03,548 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:34:04,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13852#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:34:04,713 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:34:04,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:34:04,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 62, 64] total 166 [2021-11-25 20:34:04,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988128270] [2021-11-25 20:34:04,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:34:04,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2021-11-25 20:34:04,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:34:04,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2021-11-25 20:34:04,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=28549, Unknown=0, NotChecked=0, Total=29070 [2021-11-25 20:34:04,716 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 166 states, 166 states have (on average 1.1144578313253013) internal successors, (185), 166 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:34:27,525 INFO L93 Difference]: Finished difference Result 137 states and 152 transitions. [2021-11-25 20:34:27,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-25 20:34:27,526 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 1.1144578313253013) internal successors, (185), 166 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-25 20:34:27,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:34:27,527 INFO L225 Difference]: With dead ends: 137 [2021-11-25 20:34:27,527 INFO L226 Difference]: Without dead ends: 134 [2021-11-25 20:34:27,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 111 SyntacticMatches, 21 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10125 ImplicationChecksByTransitivity, 43.4s TimeCoverageRelationStatistics Valid=1174, Invalid=49676, Unknown=0, NotChecked=0, Total=50850 [2021-11-25 20:34:27,531 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 9186 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 9362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 9186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:34:27,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 223 Invalid, 9362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 9186 Invalid, 0 Unknown, 0 Unchecked, 7.2s Time] [2021-11-25 20:34:27,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-25 20:34:27,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 127. [2021-11-25 20:34:27,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.126984126984127) internal successors, (142), 126 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:27,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 142 transitions. [2021-11-25 20:34:27,580 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 142 transitions. Word has length 76 [2021-11-25 20:34:27,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:34:27,581 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 142 transitions. [2021-11-25 20:34:27,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 1.1144578313253013) internal successors, (185), 166 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:27,581 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 142 transitions. [2021-11-25 20:34:27,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 20:34:27,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:34:27,582 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:34:27,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:34:27,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:27,783 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:34:27,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:34:27,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1813218302, now seen corresponding path program 19 times [2021-11-25 20:34:27,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:34:27,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505824180] [2021-11-25 20:34:27,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:34:27,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:34:27,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:34:27,976 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:34:27,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505824180] [2021-11-25 20:34:27,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505824180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:34:27,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203374982] [2021-11-25 20:34:27,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:34:27,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:27,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:34:27,981 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:34:27,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:34:28,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:28,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:34:28,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:34:28,402 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:34:28,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:34:28,554 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:34:28,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203374982] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:34:28,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1562729149] [2021-11-25 20:34:28,556 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:34:28,556 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:34:28,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:34:28,557 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:34:28,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:34:28,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:28,598 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:34:28,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:34:28,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:28,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:34:28,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:28,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:34:28,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:28,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:34:28,703 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:34:28,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:34:28,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:34:28,971 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:34:29,171 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14967#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:34:29,171 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:34:29,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:34:29,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 20:34:29,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579613891] [2021-11-25 20:34:29,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:34:29,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:34:29,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:34:29,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:34:29,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:34:29,173 INFO L87 Difference]: Start difference. First operand 127 states and 142 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:29,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:34:29,606 INFO L93 Difference]: Finished difference Result 252 states and 282 transitions. [2021-11-25 20:34:29,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:34:29,606 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-25 20:34:29,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:34:29,607 INFO L225 Difference]: With dead ends: 252 [2021-11-25 20:34:29,607 INFO L226 Difference]: Without dead ends: 128 [2021-11-25 20:34:29,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:34:29,608 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 589 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:34:29,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 589 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:34:29,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-25 20:34:29,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-11-25 20:34:29,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.125984251968504) internal successors, (143), 127 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:29,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 143 transitions. [2021-11-25 20:34:29,657 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 143 transitions. Word has length 77 [2021-11-25 20:34:29,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:34:29,657 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 143 transitions. [2021-11-25 20:34:29,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:29,657 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 143 transitions. [2021-11-25 20:34:29,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 20:34:29,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:34:29,658 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:34:29,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:34:29,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:34:29,873 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:34:29,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:34:29,873 INFO L85 PathProgramCache]: Analyzing trace with hash 823839124, now seen corresponding path program 20 times [2021-11-25 20:34:29,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:34:29,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991571181] [2021-11-25 20:34:29,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:34:29,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:34:29,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:30,064 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-25 20:34:30,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:34:30,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991571181] [2021-11-25 20:34:30,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [991571181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:34:30,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168649772] [2021-11-25 20:34:30,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:34:30,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:30,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:34:30,069 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:34:30,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:34:30,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:34:30,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:34:30,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:34:30,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:34:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-25 20:34:30,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:34:30,670 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-25 20:34:30,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168649772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:34:30,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142991711] [2021-11-25 20:34:30,671 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:34:30,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:34:30,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:34:30,672 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:34:30,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:34:30,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:30,720 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:34:30,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:34:30,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:30,755 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:34:30,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:34:30,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:30,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:34:30,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:30,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:34:30,835 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:34:30,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:34:30,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:34:31,088 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:34:31,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16226#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:34:31,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:34:31,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:34:31,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 20:34:31,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640676287] [2021-11-25 20:34:31,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:34:31,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:34:31,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:34:31,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:34:31,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:34:31,266 INFO L87 Difference]: Start difference. First operand 128 states and 143 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:31,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:34:31,607 INFO L93 Difference]: Finished difference Result 187 states and 215 transitions. [2021-11-25 20:34:31,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:34:31,607 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-25 20:34:31,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:34:31,608 INFO L225 Difference]: With dead ends: 187 [2021-11-25 20:34:31,608 INFO L226 Difference]: Without dead ends: 86 [2021-11-25 20:34:31,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 217 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:34:31,609 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:34:31,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 19 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [291 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:34:31,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-25 20:34:31,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-25 20:34:31,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2021-11-25 20:34:31,640 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 78 [2021-11-25 20:34:31,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:34:31,641 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2021-11-25 20:34:31,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:31,641 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2021-11-25 20:34:31,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 20:34:31,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:34:31,641 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:34:31,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:34:31,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:31,842 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:34:31,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:34:31,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1518045775, now seen corresponding path program 21 times [2021-11-25 20:34:31,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:34:31,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829836628] [2021-11-25 20:34:31,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:34:31,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:34:32,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:41,501 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 36 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:34:41,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:34:41,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829836628] [2021-11-25 20:34:41,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829836628] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:34:41,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652574314] [2021-11-25 20:34:41,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:34:41,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:41,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:34:41,502 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:34:41,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:34:41,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:34:41,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:34:41,739 WARN L261 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 263 conjunts are in the unsatisfiable core [2021-11-25 20:34:41,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:34:50,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:34:50,809 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:34:50,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-11-25 20:34:51,041 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:34:51,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:12,334 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-25 20:35:12,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-25 20:35:27,631 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-25 20:35:27,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-25 20:35:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:35:27,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652574314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:35:27,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707788619] [2021-11-25 20:35:27,850 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:35:27,851 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:27,851 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:27,851 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:27,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:27,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,895 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:35:27,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:35:27,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:35:27,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:35:27,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:27,996 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:35:27,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:35:28,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:35:28,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:29,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17474#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:29,525 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:29,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:35:29,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 70, 72] total 188 [2021-11-25 20:35:29,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416912730] [2021-11-25 20:35:29,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:29,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2021-11-25 20:35:29,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:29,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-11-25 20:35:29,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=695, Invalid=36361, Unknown=0, NotChecked=0, Total=37056 [2021-11-25 20:35:29,529 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 188 states, 188 states have (on average 1.1063829787234043) internal successors, (208), 188 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:07,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:07,992 INFO L93 Difference]: Finished difference Result 237 states and 263 transitions. [2021-11-25 20:36:07,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-25 20:36:07,993 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 1.1063829787234043) internal successors, (208), 188 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-25 20:36:07,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:07,994 INFO L225 Difference]: With dead ends: 237 [2021-11-25 20:36:07,994 INFO L226 Difference]: Without dead ends: 233 [2021-11-25 20:36:07,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 117 SyntacticMatches, 29 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16967 ImplicationChecksByTransitivity, 57.7s TimeCoverageRelationStatistics Valid=1953, Invalid=69603, Unknown=0, NotChecked=0, Total=71556 [2021-11-25 20:36:07,999 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 49 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 17155 mSolverCounterSat, 818 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 17973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 818 IncrementalHoareTripleChecker+Valid, 17155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:07,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 233 Invalid, 17973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [818 Valid, 17155 Invalid, 0 Unknown, 0 Unchecked, 15.1s Time] [2021-11-25 20:36:08,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-25 20:36:08,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 189. [2021-11-25 20:36:08,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.122340425531915) internal successors, (211), 188 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:08,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 211 transitions. [2021-11-25 20:36:08,072 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 211 transitions. Word has length 85 [2021-11-25 20:36:08,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:08,073 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 211 transitions. [2021-11-25 20:36:08,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 1.1063829787234043) internal successors, (208), 188 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:08,073 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 211 transitions. [2021-11-25 20:36:08,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 20:36:08,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:08,074 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:08,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:08,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:36:08,274 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:36:08,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:08,277 INFO L85 PathProgramCache]: Analyzing trace with hash 138261447, now seen corresponding path program 22 times [2021-11-25 20:36:08,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:08,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194572550] [2021-11-25 20:36:08,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:08,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:08,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:08,505 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:36:08,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:08,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194572550] [2021-11-25 20:36:08,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194572550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:08,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235989789] [2021-11-25 20:36:08,505 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:36:08,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:08,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:08,507 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:08,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:36:08,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:08,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:36:08,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:08,966 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:36:08,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:09,099 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 20:36:09,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235989789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:09,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898184233] [2021-11-25 20:36:09,101 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:36:09,101 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:09,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:09,101 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:09,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:09,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,147 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:36:09,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:36:09,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,176 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:36:09,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:36:09,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:36:09,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:09,249 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:36:09,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:36:09,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:36:09,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:09,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19009#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:36:09,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:09,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:09,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-25 20:36:09,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235515480] [2021-11-25 20:36:09,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:09,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:36:09,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:09,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:36:09,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:36:09,633 INFO L87 Difference]: Start difference. First operand 189 states and 211 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:10,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:10,096 INFO L93 Difference]: Finished difference Result 320 states and 355 transitions. [2021-11-25 20:36:10,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:36:10,097 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-25 20:36:10,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:10,098 INFO L225 Difference]: With dead ends: 320 [2021-11-25 20:36:10,098 INFO L226 Difference]: Without dead ends: 143 [2021-11-25 20:36:10,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:36:10,100 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:10,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:36:10,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-25 20:36:10,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-11-25 20:36:10,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1126760563380282) internal successors, (158), 142 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:10,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 158 transitions. [2021-11-25 20:36:10,183 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 158 transitions. Word has length 86 [2021-11-25 20:36:10,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:10,183 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 158 transitions. [2021-11-25 20:36:10,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:10,184 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 158 transitions. [2021-11-25 20:36:10,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 20:36:10,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:10,185 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:10,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:10,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:10,409 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:36:10,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:10,409 INFO L85 PathProgramCache]: Analyzing trace with hash -375630095, now seen corresponding path program 23 times [2021-11-25 20:36:10,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:10,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120580525] [2021-11-25 20:36:10,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:10,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:10,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:10,637 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2021-11-25 20:36:10,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:10,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120580525] [2021-11-25 20:36:10,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120580525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:10,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455831238] [2021-11-25 20:36:10,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:10,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:10,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:10,641 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:10,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:36:10,900 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:36:10,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:10,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:36:10,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:11,324 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2021-11-25 20:36:11,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:11,468 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2021-11-25 20:36:11,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455831238] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:11,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348149474] [2021-11-25 20:36:11,470 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:36:11,470 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:11,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:11,470 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:11,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:11,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:11,509 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:36:11,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:36:11,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:11,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:36:11,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:11,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:36:11,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:11,596 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:36:11,620 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:36:11,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:36:11,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:36:11,889 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:12,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20501#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:36:12,120 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:12,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:12,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-25 20:36:12,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674877306] [2021-11-25 20:36:12,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:12,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:36:12,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:12,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:36:12,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:36:12,122 INFO L87 Difference]: Start difference. First operand 143 states and 158 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:12,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:12,782 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2021-11-25 20:36:12,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:36:12,782 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-25 20:36:12,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:12,783 INFO L225 Difference]: With dead ends: 208 [2021-11-25 20:36:12,783 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 20:36:12,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 245 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 20:36:12,784 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 843 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 1464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 843 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:12,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 11 Invalid, 1464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [843 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:36:12,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 20:36:12,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-25 20:36:12,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:12,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2021-11-25 20:36:12,821 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 87 [2021-11-25 20:36:12,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:12,821 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2021-11-25 20:36:12,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:12,821 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2021-11-25 20:36:12,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:36:12,822 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:12,822 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:12,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-25 20:36:13,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:13,030 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:36:13,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:13,031 INFO L85 PathProgramCache]: Analyzing trace with hash -1520980926, now seen corresponding path program 24 times [2021-11-25 20:36:13,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:13,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910083405] [2021-11-25 20:36:13,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:13,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:13,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:26,282 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 30 proven. 375 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:26,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:26,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910083405] [2021-11-25 20:36:26,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910083405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:26,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613840918] [2021-11-25 20:36:26,283 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:36:26,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:26,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:26,284 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:26,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:36:26,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:36:26,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:26,551 WARN L261 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 295 conjunts are in the unsatisfiable core [2021-11-25 20:36:26,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:38,949 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:36:38,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:06,864 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-25 20:37:06,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-25 20:37:30,391 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-25 20:37:30,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-25 20:37:30,655 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:37:30,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613840918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:30,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821987177] [2021-11-25 20:37:30,656 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:37:30,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:30,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:30,657 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:30,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:30,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:30,691 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:37:30,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:37:30,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:30,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:37:30,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:30,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:37:30,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:30,774 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:37:30,798 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:37:30,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:37:30,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:37:31,049 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:32,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21900#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:32,634 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:32,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:32,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 78, 80] total 211 [2021-11-25 20:37:32,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813700596] [2021-11-25 20:37:32,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:32,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 211 states [2021-11-25 20:37:32,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:32,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 211 interpolants. [2021-11-25 20:37:32,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=45601, Unknown=0, NotChecked=0, Total=46440 [2021-11-25 20:37:32,643 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 211 states, 211 states have (on average 1.09478672985782) internal successors, (231), 211 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:42,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:42,166 INFO L93 Difference]: Finished difference Result 348 states and 391 transitions. [2021-11-25 20:38:42,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2021-11-25 20:38:42,167 INFO L78 Accepts]: Start accepts. Automaton has has 211 states, 211 states have (on average 1.09478672985782) internal successors, (231), 211 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-25 20:38:42,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:42,168 INFO L225 Difference]: With dead ends: 348 [2021-11-25 20:38:42,168 INFO L226 Difference]: Without dead ends: 344 [2021-11-25 20:38:42,172 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 130 SyntacticMatches, 29 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26499 ImplicationChecksByTransitivity, 89.8s TimeCoverageRelationStatistics Valid=3117, Invalid=98325, Unknown=0, NotChecked=0, Total=101442 [2021-11-25 20:38:42,172 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 36 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 23320 mSolverCounterSat, 1164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 24484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1164 IncrementalHoareTripleChecker+Valid, 23320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:42,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 529 Invalid, 24484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1164 Valid, 23320 Invalid, 0 Unknown, 0 Unchecked, 24.9s Time] [2021-11-25 20:38:42,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-11-25 20:38:42,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 209. [2021-11-25 20:38:42,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 208 states have (on average 1.1105769230769231) internal successors, (231), 208 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:42,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 231 transitions. [2021-11-25 20:38:42,279 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 231 transitions. Word has length 94 [2021-11-25 20:38:42,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:42,280 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 231 transitions. [2021-11-25 20:38:42,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 211 states, 211 states have (on average 1.09478672985782) internal successors, (231), 211 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:42,280 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 231 transitions. [2021-11-25 20:38:42,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 20:38:42,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:42,281 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:42,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:42,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 20:38:42,494 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:42,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:42,494 INFO L85 PathProgramCache]: Analyzing trace with hash -2090546530, now seen corresponding path program 25 times [2021-11-25 20:38:42,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:42,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996272867] [2021-11-25 20:38:42,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:42,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:42,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:42,749 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-25 20:38:42,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:42,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996272867] [2021-11-25 20:38:42,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996272867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:42,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982199138] [2021-11-25 20:38:42,749 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:38:42,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:42,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:42,753 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:42,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:38:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:42,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:38:42,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:43,305 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-25 20:38:43,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:43,454 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-25 20:38:43,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982199138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:43,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654622670] [2021-11-25 20:38:43,455 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:38:43,455 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:43,455 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:43,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:43,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:43,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,506 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:43,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:43,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:38:43,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:38:43,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:43,574 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:38:43,592 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:38:43,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:38:43,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:38:43,834 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:44,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23804#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:44,068 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:44,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:44,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-25 20:38:44,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029695618] [2021-11-25 20:38:44,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:44,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:38:44,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:44,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:38:44,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:38:44,069 INFO L87 Difference]: Start difference. First operand 209 states and 231 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:44,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:44,689 INFO L93 Difference]: Finished difference Result 354 states and 389 transitions. [2021-11-25 20:38:44,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:38:44,690 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-25 20:38:44,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:44,691 INFO L225 Difference]: With dead ends: 354 [2021-11-25 20:38:44,691 INFO L226 Difference]: Without dead ends: 158 [2021-11-25 20:38:44,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:38:44,693 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 987 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:44,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 987 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:38:44,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-25 20:38:44,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2021-11-25 20:38:44,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.1019108280254777) internal successors, (173), 157 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:44,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 173 transitions. [2021-11-25 20:38:44,783 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 173 transitions. Word has length 95 [2021-11-25 20:38:44,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:44,783 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 173 transitions. [2021-11-25 20:38:44,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:44,783 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 173 transitions. [2021-11-25 20:38:44,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 20:38:44,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:44,784 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:44,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:44,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:38:44,985 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:44,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:44,985 INFO L85 PathProgramCache]: Analyzing trace with hash 584718004, now seen corresponding path program 26 times [2021-11-25 20:38:44,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:44,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706103267] [2021-11-25 20:38:44,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:44,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:45,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:45,242 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-25 20:38:45,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:45,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706103267] [2021-11-25 20:38:45,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706103267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:45,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819135832] [2021-11-25 20:38:45,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:45,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:45,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:45,245 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:45,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:38:45,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:38:45,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:45,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:38:45,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:46,010 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-25 20:38:46,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:46,160 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-25 20:38:46,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819135832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:46,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624688861] [2021-11-25 20:38:46,161 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:38:46,161 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:46,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:46,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:46,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:46,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:46,193 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:38:46,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:38:46,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:46,222 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:38:46,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:38:46,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:46,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:38:46,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:46,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:38:46,324 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:38:46,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:38:46,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:38:46,606 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:46,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25454#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:38:46,863 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:46,863 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:46,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-25 20:38:46,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674007477] [2021-11-25 20:38:46,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:46,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:38:46,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:46,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:38:46,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:38:46,865 INFO L87 Difference]: Start difference. First operand 158 states and 173 transitions. Second operand has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:47,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:47,619 INFO L93 Difference]: Finished difference Result 228 states and 255 transitions. [2021-11-25 20:38:47,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:38:47,620 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-25 20:38:47,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:47,620 INFO L225 Difference]: With dead ends: 228 [2021-11-25 20:38:47,620 INFO L226 Difference]: Without dead ends: 104 [2021-11-25 20:38:47,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 271 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1147 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:38:47,621 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 741 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 741 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:47,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 19 Invalid, 1555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [741 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:38:47,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-25 20:38:47,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-25 20:38:47,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:47,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2021-11-25 20:38:47,671 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2021-11-25 20:38:47,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:47,671 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2021-11-25 20:38:47,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:47,672 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2021-11-25 20:38:47,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:38:47,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:47,672 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:38:47,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:47,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:47,873 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:38:47,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:47,873 INFO L85 PathProgramCache]: Analyzing trace with hash -166367441, now seen corresponding path program 27 times [2021-11-25 20:38:47,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:47,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015780059] [2021-11-25 20:38:47,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:47,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:48,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:05,898 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 56 proven. 439 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:39:05,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:05,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015780059] [2021-11-25 20:39:05,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015780059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:05,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583910677] [2021-11-25 20:39:05,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:39:05,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:05,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:05,900 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:05,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:39:06,223 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:39:06,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:06,232 WARN L261 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 327 conjunts are in the unsatisfiable core [2021-11-25 20:39:06,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:23,919 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:39:23,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:04,686 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-25 20:40:04,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 1116 [2021-11-25 20:40:50,176 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-25 20:40:50,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 65 [2021-11-25 20:40:50,479 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:40:50,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583910677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:50,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560098451] [2021-11-25 20:40:50,481 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:40:50,481 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:50,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:50,481 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:50,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:50,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,513 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:40:50,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:40:50,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,540 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:40:50,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:40:50,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:40:50,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,606 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:40:50,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-25 20:40:50,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:40:50,779 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:52,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26989#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:52,498 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:52,498 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:52,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 86, 88] total 232 [2021-11-25 20:40:52,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296797079] [2021-11-25 20:40:52,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:52,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 232 states [2021-11-25 20:40:52,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:52,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 232 interpolants. [2021-11-25 20:40:52,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=938, Invalid=54994, Unknown=0, NotChecked=0, Total=55932 [2021-11-25 20:40:52,502 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 232 states, 232 states have (on average 1.0862068965517242) internal successors, (252), 232 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:42,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:42,271 INFO L93 Difference]: Finished difference Result 391 states and 430 transitions. [2021-11-25 20:42:42,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 183 states. [2021-11-25 20:42:42,272 INFO L78 Accepts]: Start accepts. Automaton has has 232 states, 232 states have (on average 1.0862068965517242) internal successors, (252), 232 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-25 20:42:42,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:42,274 INFO L225 Difference]: With dead ends: 391 [2021-11-25 20:42:42,274 INFO L226 Difference]: Without dead ends: 387 [2021-11-25 20:42:42,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 135 SyntacticMatches, 39 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32354 ImplicationChecksByTransitivity, 142.2s TimeCoverageRelationStatistics Valid=4565, Invalid=133447, Unknown=0, NotChecked=0, Total=138012 [2021-11-25 20:42:42,282 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 31 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 28653 mSolverCounterSat, 1212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 29865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1212 IncrementalHoareTripleChecker+Valid, 28653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:42,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 567 Invalid, 29865 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1212 Valid, 28653 Invalid, 0 Unknown, 0 Unchecked, 31.8s Time] [2021-11-25 20:42:42,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-25 20:42:42,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 230. [2021-11-25 20:42:42,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.1048034934497817) internal successors, (253), 229 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:42,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 253 transitions. [2021-11-25 20:42:42,497 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 253 transitions. Word has length 103 [2021-11-25 20:42:42,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:42,497 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 253 transitions. [2021-11-25 20:42:42,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 232 states, 232 states have (on average 1.0862068965517242) internal successors, (252), 232 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:42,498 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 253 transitions. [2021-11-25 20:42:42,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 20:42:42,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:42,499 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:42,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:42,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:42:42,713 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:42,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:42,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1484759719, now seen corresponding path program 28 times [2021-11-25 20:42:42,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:42,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069790254] [2021-11-25 20:42:42,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:42,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:42,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:42,994 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-25 20:42:42,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:42,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069790254] [2021-11-25 20:42:42,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069790254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:42,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869375223] [2021-11-25 20:42:42,995 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:42:42,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:42,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:42,995 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:42,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 20:42:43,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:43,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:42:43,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-25 20:42:43,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:43,669 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-25 20:42:43,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869375223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:43,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894800939] [2021-11-25 20:42:43,672 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:42:43,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:43,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:43,673 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:43,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:43,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:43,706 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-25 20:42:43,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-25 20:42:43,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:43,735 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:43,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:43,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:43,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:42:43,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:43,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:42:43,819 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:42:43,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:42:43,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:42:44,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:44,248 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29145#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:42:44,248 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:44,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:44,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-25 20:42:44,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863366440] [2021-11-25 20:42:44,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:44,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:42:44,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:44,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:42:44,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:42:44,250 INFO L87 Difference]: Start difference. First operand 230 states and 253 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:44,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:44,980 INFO L93 Difference]: Finished difference Result 389 states and 425 transitions. [2021-11-25 20:42:44,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:42:44,980 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-25 20:42:44,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:44,981 INFO L225 Difference]: With dead ends: 389 [2021-11-25 20:42:44,981 INFO L226 Difference]: Without dead ends: 174 [2021-11-25 20:42:44,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:42:44,982 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 1025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:44,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 1025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:42:44,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-25 20:42:45,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2021-11-25 20:42:45,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0982658959537572) internal successors, (190), 173 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:45,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 190 transitions. [2021-11-25 20:42:45,094 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 190 transitions. Word has length 104 [2021-11-25 20:42:45,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:45,094 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 190 transitions. [2021-11-25 20:42:45,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:45,094 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 190 transitions. [2021-11-25 20:42:45,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-25 20:42:45,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:45,095 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:45,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:45,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:45,295 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:45,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:45,295 INFO L85 PathProgramCache]: Analyzing trace with hash 412061521, now seen corresponding path program 29 times [2021-11-25 20:42:45,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:45,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905232820] [2021-11-25 20:42:45,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:45,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:45,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2021-11-25 20:42:45,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:45,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905232820] [2021-11-25 20:42:45,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905232820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:45,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801960825] [2021-11-25 20:42:45,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:42:45,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:45,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:45,593 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:45,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:42:45,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:42:45,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:45,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:42:45,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:46,343 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2021-11-25 20:42:46,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:46,551 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2021-11-25 20:42:46,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801960825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:46,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1278015272] [2021-11-25 20:42:46,552 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 20:42:46,553 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:46,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:46,553 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:46,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:46,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:46,612 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-25 20:42:46,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-25 20:42:46,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:46,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-25 20:42:46,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:46,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:42:46,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:46,672 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:42:46,690 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:42:46,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-25 20:42:46,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:42:46,910 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:47,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30947#(and (<= ~SIZE~0 32767) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:42:47,091 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:47,091 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:47,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-25 20:42:47,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256810628] [2021-11-25 20:42:47,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:47,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:42:47,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:47,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:42:47,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1447, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:42:47,093 INFO L87 Difference]: Start difference. First operand 174 states and 190 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 38 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:47,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:47,632 INFO L93 Difference]: Finished difference Result 251 states and 280 transitions. [2021-11-25 20:42:47,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:42:47,632 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 38 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-11-25 20:42:47,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:47,633 INFO L225 Difference]: With dead ends: 251 [2021-11-25 20:42:47,633 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:42:47,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 295 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=726, Invalid=2244, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:42:47,634 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 61 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 501 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 501 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:47,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 11 Invalid, 784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [501 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:42:47,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:42:47,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-25 20:42:47,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:47,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2021-11-25 20:42:47,701 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2021-11-25 20:42:47,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:47,702 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2021-11-25 20:42:47,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 38 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:47,702 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2021-11-25 20:42:47,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 20:42:47,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:47,702 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:47,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:47,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:47,905 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:47,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:47,905 INFO L85 PathProgramCache]: Analyzing trace with hash -676144670, now seen corresponding path program 30 times [2021-11-25 20:42:47,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:47,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966853687] [2021-11-25 20:42:47,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:47,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:48,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:08,397 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 100 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:43:08,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:08,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966853687] [2021-11-25 20:43:08,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966853687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:08,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753815837] [2021-11-25 20:43:08,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:43:08,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:08,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:08,403 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:08,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2adb0d-1f55-4f93-861b-b3eb10bee313/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 20:43:08,727 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:43:08,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:08,733 WARN L261 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 359 conjunts are in the unsatisfiable core [2021-11-25 20:43:08,736 INFO L286 TraceCheckSpWp]: Computing forward predicates...